US Bridges

Nfa A057 over Mack Branch

Fair

Johnson County, Tennessee · 1 M NW of SR 67 · Structure no. 460A0570001

Built
1993
32 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
140
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A057 over Mack Branch is a concrete continuous culvert carrying Nfa A057 over Mack Branch in Johnson County, Tennessee. It was built in 1993, so it is 32 years old, younger than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 140 vehicles a day, roughly 5% of them trucks, projected to reach 224 by 2040. The structure is 26 ft (8 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNfa A057
CrossesMack Branch
Location1 M NW of SR 67
RouteCounty Highway 57
CountyJohnson County
StateTennessee
Coordinates36.43833, -81.94055
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length26 ft (8 m)
Longest span12 ft (3.7 m)
Deck width34 ft (10.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2020)
Projected traffic224 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A057 over Mack Branch built?

It was built in 1993, making it 32 years old in 2025.

What condition is Nfa A057 over Mack Branch in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does Nfa A057 over Mack Branch carry?

About 140 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Nfa A057 over Mack Branch?

The structure is 26 ft (8 m) long with a longest span of 12 ft (3.7 m) and a deck 34 ft wide.

Who owns Nfa A057 over Mack Branch?

It is owned by the County Highway Agency.